28-July-2014 Half the machining completed. The roof with the access opening (larger) to the cab interior, and waterglass valve access opening (smaller, top). The sheetmetal is sitting on top of a piece of plastic which came from a ceiling light difuser panel. It was used to template the finished roof, curving it around the cab (which was installed on the engine which was in the travel trailer, not in the shop). The plastic easily bent around the curved roof profile, allowing us to size up the sheet metal when flat, but it had one side which was brittle and did not cut well. The idea of using a flexible piece of material to size up the roof (which we could not do with metal because we could not machine it after bending) was the right idea, but using this ceiling difuser was not the right material since it did not cut but wanted to break instead.